Umicore sells $6-$year maturity semi$-$annual coupon bonds at $105\mathrm{.}00\%$ of par value. What is the coupon rate on these bonds if the yield to maturity is $8\mathrm{.}20\%?$

no excel pls

a$.$

$7\mathrm{.}73\%$

b$.$

$9\mathrm{.}27\%$

c$.$

$11\mathrm{.}13\%$

d$.$

$12\mathrm{.}30\%$

e$.$

$4\mathrm{.}64\%$